[gnome-games] dummy-developer: Use "" instead of "Unknown"

[Alexander Mikhaylenko <alexm src gnome org>]

commit 578f54105c4b24290492083c37f1a1680b3ebea7
Author: theawless <theawless gmail com>
Date:   Sun Aug 26 03:06:17 2018 +0530

    dummy-developer: Use "" instead of "Unknown"

 po/POTFILES.in                 | 1 -
 src/dummy/dummy-developer.vala | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 8155d72d..fe72d8c8 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -52,7 +52,6 @@ src/command/command-runner.vala
 src/core/media-set/media-set.vala
 src/core/plugin-registrar.vala
 src/dummy/dummy-description.vala
-src/dummy/dummy-developer.vala
 src/dummy/dummy-platform.vala
 src/dummy/dummy-players.vala
 src/dummy/dummy-publisher.vala
diff --git a/src/dummy/dummy-developer.vala b/src/dummy/dummy-developer.vala
index def738fb..e3462812 100644
--- a/src/dummy/dummy-developer.vala
+++ b/src/dummy/dummy-developer.vala
@@ -2,6 +2,6 @@
 
 public class Games.DummyDeveloper : Object, Developer {
        public string get_developer () {
-               return _("Unknown");
+               return "";
        }
 }